Apparatus for making cement.



H. L. DUNCAN.

APPARATUS FOR MAKING CEMENT.

APPLICATION FILED JUNE 20, 1910.

Patented Oct. 13, 1914.

2 SHEBTS-wSHBET 1.

INVENTOR WITNESSES:

W ATTORNEYS H. L. DUNCAN.

' APPARATUS FOR MAKING CEMENT.

APPLICATION FILED JUNE 20, 1910.

1T E E N on mm A E not necessary HARRY 1.. Duncan, or new YORK, iv. Y.

AZPfPARA'I'I IS non MAKING CEMENT.

Continuation of application Serial No. 180,996, filed November 13, 1903.

Specification of Letters Patent.

Patented Oct. 13, 1914. This application filed June 20,

1910. SerialNo.567,78.

To-aZZ whom it may concern:

Be it known that I, HARRY L. DUnoAN, a citizen of the United States, and resident of New York city, in the borough of Brooklyn, county of Kings, and State of New York, have invented certain new and useful Improvements in Apparatus for Making- Cement, of which the following is a specification, taken in connection with the accompanying drawings, which form a part of the same.

This invention relates to apparatus for the manufacture of slag cement in which it is to incorporate or add hydrated lime.

Blast furnace slag which is the waste product from iron furnaces may, be used or slag may be. specially smelted for use 111 this apparatus, if desired. The basic blast furnace slag, such as is produced as a by-prodnot in the manufacture of gray pig iron, seems to be best adapted for this use and this high limed slag, preferably contains 45 to 50 per cent. of lime and not more than 35 per cent. of silica. Basic slag of this description when allowed to cool in large masses in air sometimes decrepitates spontaneously into an impalpable powder.

Basic blast furnace slag may be treated so as to convert the same into material containing considerable proportions of active slag cement material. Usually in the commercial operationthis active cement mater1al is not formed in an absolutely pure state, although when water granulated furnace slag is roasted up to a plastic condition which usually corresponds with a temperature of about 1200 Centigrade and then quickly cooled a comparatively pure active cement.

material is formed. This active material does not decrepitate in air and it seems to have a crystalline structure as is evidenced by the fact that it polarizes light. The annealing process to which the slag has been subjected in forming active cement material as herein described and by which the slag is maintained in the annealing or plastic temperature for a considerable length of time seems" to affect a rearrangement of the molecular structure of the slag and a. formation of compounds different from those occurring in water granulated slag. When active slag cement material is finely ground, slightly moistened, compressed into a cake and subjected to carbon-dioxid, a very considerable rise of temperature takes place, the compressed cake of active material showing a rise of 40 or so centigrade in an atmosphere of pure carbon-dioxid. Inert slag cement 1 material may also be formed from blast furnace slag and this inert material is found in a v comparatively pure condition in water-granulated slag dried at 200 centigrade. This inert material does not decrepitate in air and seems to have a glassy or non-crystalline structure as indicated by the fact that it does not polarize light. This inert material when finely ground, moistened, compressed into a cake and treated with carbon-diox'id only gives an inconsiderable rise of temperature as compared with that produced with active cement material.

Inert material, such as chilled slag, or such as dried water granulated slag when mixed in a finely powdered condition with about equalparts of active cement material, such as annealed molten furnace slag or roasted water granulated slag produces a valuable highly cementitious' material. The setting time of this cementitious mixture may, however, be regulated audits properties improved to some extent by an admix-' ture of about ten per cent. of ordinary Portland cement and also in some cases, if desired, by a further admixture of calcium sulfate to the extent ofia few per cent.

In the accompanying drawings in which the same reference numeral refers to similar. par-ts the several figures, Figure 1 is an elevation partly in section of an illustrative apparatus. Fig.2 is.a similar partial elevation of a modified construction of apparatus.

A moving congealing surface may be used in this apparatus to congeal substantially molten furnace slag into a consistent stream for treatment. In the drawings, a congealing roll 2 which should have a diameter ofthree or four feet or so is indicated for this purpose. This roll is preferably provided. with a water space 29 so that the congealing surface is kept at the proper temperature by a circulation of water or other fluid, each of the trunnions being formed with an aperture 20 to secure this circulation. This roll which may be used with a cooperating congealing surface of any description is indi- 'cated as being formed with the gear 17 in engagement with the pinion 16 secured to, an electric motor 15 or other adjustable speed driving device by which the speed of rotation of the congealing roll may be varied to suit the requirements of the operation.

The cooperating congealing roll 1 is indicated as being formed with a similar water space 28, each of the trunnions of this roll being formed with a suitable aperture 19 to secure the circulation of the proper cooling fluid. This roll is preferably provided with the gear 18 which may mesh with the gear 17 on the roll 2 so as to rotate these cooperating rolls in unison or the roll 1 may be positively rotated in any other desired way. The rolllis adjustable with respect to theother congealing roll so as to vary the distance between them, the trumiion block 53 of the roll 1 being mounted in a slot and adjusted by heavy screws 51, as indicated. Besides the internal cooling means described, additional external cooling means may be employed, if desired; The cooling chamber 4: may be formed partially inclosing the roll 1, the upper end of the chamber being preferably closely adjacent the roll in the form of a scraper to remove surplus cooling fluid. A number of spray pipes 22 are indicated within the chamber to furnish sprays of cooling fluid, such as water, to the roll, so that the'heat of the roll is rapidly dissipated and removed from the exterior portions of the congealing surface. The chilling surface is thereby more quickly cooled than if all the heat were conducted inward to be absorbed by the internal water jacket. The

amount of cooling fluids supplied through the spray pipes 22 is regulated by a suitable valve 26 in the supply pipe. A similar cooling chamber 5 is formed around the cooperating roll 2 and a number of spray pipes 38 are shown cooperating with the upper part of the roll Within the chamber furnished with the desired amount of cooling fluid by the valve 39 in the supply pipe. Another series of spray pipes 21 cooperate with the lower portionof this roll and the amount of fluid which they furnish is regulated by the valve 40 in the supply pipe with whichthey are connected. The surplus cooling fluid is removed from the chamber through the aperture 59 at the bottom.

The scraper 56 is mounted adjacent the congealingmoll l and disengages the congealed consistent stream from this roll and this stream 49 moves down the opposite surface of the congealing roll 2 and is disengaged therefrom by the upper scraping edge of the stationary conveyer 27. This conveyer is preferably formed with a suitable jacket 30 within which water, steam or other fluid may be maintained to regulate the tem-.

perature of this conveyer. The, consistent slag stream 49 may move directly from the a stationary conveyer upon a suitable moving conveyer 9, as'indicated in Fig. 2 and this moving conveyer which may be in the form of a belt 9 of metal orother suitable main Fig. 2 and suitable heating means, such as the heat supply flue 54; supplying heated gases which may pass out through the discharge flue 55 to the extent governed by the control valve 57, may be used, if desired, to maintain the slag on the moving conveyer in the plastic annealing condition, preferably for a couple of minutes or so. Suitable gates 58 provided with rolls to engage the slag material may be mounted at either end of the annealing chamber to prevent the escape of heat at these points. If desired, .however, a suitable breaker may be used to break up the consistent stream 49 and this fbreaker 6 may take the form of a rapidly rotating toothed wheel indicated in Fig. 1 1 Where it is shown mounted to rotate adjacent the end of the conveyer or guide 27 The f pieces of slag are thus piled up on the moving conveyer 9 below, whichis shown as passing over the guide 51 and mounted upon the drums 31, 32 spaced apart at a suitable distance. A spring-pressed tightening roll 33 may be used in connection with this conveyer, this roll being shown as mounted in the slotted frame 3d. The drum 31 is rotated at the speed desired by any means and may be. rotated by a suitable Worm Wheel 47 secured to the drum and engaged by. the cooperating worm 46. This worm may be driven through the cone pulleys 8 from the driving shaft 52 and the rate of movement of the conveyer 9 may be thus regulated so that the material 50 on the conveyer is kept in the annealing condition for thetime desired, preferably a couple of minutes or more. A suitableqcooling chamber may be used adjacent the lower end of the conveyer 9, a number of spray pipes 44 being mounted in this chamber and supplied =with the desired amount of cooling fluid by the valved supply pipe 11, the surplus water draining out of the chamber as indicated.

A number of treating jets may be mounted adjacent the stationary conveyer to op- ,erate upon the slag material thereon. The jet pipes 23 extending parallel to the con- ,gealing rolls and which may be provided fwith a number of apertures along their length for the discharge of fluid are mount- ;ed adjacent the' conveyer 27 so as to supply jets of treating fluid, such as steam, air, gas jor water to the slag. The fluid supplied *to the upper jet pipe is controlled by the valve 25 and the fluid supplied to the two ;lower jet pipes 23 is controlled by a similar .separate valve, as indicated. Other jet pipes 24 are indicated by which other treating fluid, such as water, steam, air or gas may be supplied, the amount of fluid issuing from the apertures inthese 'jet pipes being controlled by the valve 26. Also, if desired,"

.It is, of course, understood thatother jet pipes maybe used at other portions of the conveyer if desired. 7

A suitable pulverizer ismounted adjacent I the conveyer and the pulverizer may take the form of theheavy toothed wheel 13 ro-- tated by suitable means adjacent the end of the conveyer. This wheel pulverizes the material which falls down asuitable chute 35 to be cooled and removed-. The rotarycooler 12 may loc -mounted to receive these particles of slag, the cooler being preferably rotated by any desired means and formed with the internally projecting ribs 37 to agitate the material and to rapidly cool the same in connection with the spray pipes 30 which furnish sprays of cooling fluid to the outside of the cooler If desired, a suitable feed roll may be employed to positively feed the proper quantity of material to the congealing rolls. In.

Fig. 2 the feed roll 59 is indicated as being provided with water space 61 each'of the trun'nions 62 being formed with a suitable aperture 63 by whichcooling fluid may be supplied to the interior of the roll. The

outside of this feed roll is preferably formed with suitable corrugations 64 and also with annular grooves with which. a suitable scraper 65 eoacts to disengage the material from the roll. This feed roll may be rotated in the direction indicated by any desired means and its trunnions are preferably adjustable with respect to. the congealing roll' 2 with which'it coo rates. The substantially molten slag 4:8 is supplied to the feeding roll by a numberof spouts, 3 located as shown in the drawing. It is not neces-' sary, however, in all cases to employ. the

separate feeding roll described, since the positi've feeding forward of the material may be alfectedby slightly roughening the sun faces of the congealing rolls themselves, if

desired.- The substantially molten slag may be supplied to the bite of the congealing rolls by a number-of slag spouts, such as 3, each of'which, as indicated in 1, supplies a s'tream 48rof-s1agi. The rame 45 of this apparatus cooperates with the conof the various gealing rolls and constitutes the sides of a slag trough which directs the. substantially molten slag between the congealing rolls. This frame is continued around the conveyer and may be provided with suitable doors, such as 7 and 14: for inspection or for the circulation of air or treating fluids through i the apparatus.

Slagmaterial containing considerable proportions of active cement material may be produced on the apparatus described. The congealing rolls are preferably adjusted so that the consistent stream ofslag material is plastic when it issues 'fromthe bite of the rolls and preferably about a quarter of an inch thick. This stream, which may be I treated with fluid on the conveyer, preferably withair or steam, should be in the plastic condition while it is upon the moving conveyer and if the breaker is used the speed arts of the apparatus should be soadjusted iihat the slag is piled up on the moving. conveyer so that the dissipation of i heat, is prevented and. the slag annealed by its own'heat, This amount of slag 50 is thus annealed on the conveyer and the conveyer should be of such length and driven at such speed that the annealing action lasts for several minutes to secure the best results If desired, however, a'suitable suban annea ing chamber is employed in connection with the conveyer thetemperature of. the chamber should be so adjusted that the'slag is properly annealed by being kept substantially in the plastic condition. Inert slag cement material may be made on this same apparatus, the congealing rolls for this purpose being'preferably adjusted considerably closer together and if desired, also they may .be rotated somewhat faster. In this way, the stream of slag may be con ealed more thoroughly and may be chille to a substantially rigid condition when issuing from the congealing rolls. In passing over the conye er, this slag may be treated with suitable uids and, indeed, jets of cooling liquid, such as water, may be freely used, sinceafter t e slag has been cooled to a certain extent the contact of water does not have a badefl'ect, the water not bein absorbed as-is the case when the molten slag is run directly into water. .In producing inert cement material therefore, the congealing rolls may be set as close together as about a sixteenth or an eighth of an inch, the resulting stream of consistent material being treated first by steam or air "if desired, and then by water jets to rapidly chill and cool the same, I the material being subsequently broken up for more convenient further treatment, it being of course unnecessary in such case to provide or operate the annealing chamber in connection with the conveyer. The materials thus producedare preferably finely pulverized and mixed together in such proportions that the mixture contains about'equal parts of active cement material and inert ce ment material, although considerable variations may be made-from these proportions. An admixture of about ten per cent. of Portland cement may be made to the mixed slag product and a further admixture of one or two per cent. of calcium sulfate may be used to improve the settin properties of thecemeiititious material ormed. If the mate-v rial produced by this processwhich contains the active cement material is not entirely pure,a--suitable allowance may be made for this fact in mixing the two kinds-of treated slag. Indeed, in some instances, the appara-. tus may be so operated'that'parts of the slag are rapidly chilled to form inert cement materialand other portions are suitably annealed to form a material containing con-- siderable proportions of active material. In this way, the resulting slag product may contain without further admixture the proper proportions of active and inert cement materials.

The. invention has been described in this case which is a continuation, that is, which contains subject-matter taken from the earlier process application 180,996, filed November 13, 1903 in connection with a number of illustrative embodiments, propor- V tions, arrangements and devices to the details of which disclosure the invention is not of course to be limited.

What is claimed is:

1. In cement apparatus, a air of congealing rolls, means to adjust t e distance between said rolls, means to circulate cooling fluids through the interior of said rolls, cool- ,ing chambers arranged adjacent said congealing rolls anddneans to supply fluid cooling jets to the portions of said rolls within said chambers, a corrugated cooled feed roll provided with a disengaging scraper cooperating with the larger ofsaid'congealing rolls, means to supply substantially molten furnace sla to said larger congealin roll adjacent said feed roll to be thereby ed in regulated quantities'between said congealing rolls and" converted into a consistent plastic slag stream, astationary cooled conveyer cooperating with said larger congealg ing roll to disengage the slag stream therefrom and guide the same over said conveyer, a rotating breaker cooperating with breaker and said slag stream on said con-' veyer, a moving conveyer to receive the said slag particles, adjustable speed devices to operate said conveyer, a substantially inclosed annealing chamber and heating means cooperating with said moving conveyer, fluid cooling jets arranged adjacent the discharge end ofsaid conveyer, a rotating disintegrator cooperating with said conveyer to disintegrate the slag material delivered therefrom and a chute and a rotating ribbed cooling cylinder to receive and cool said disintegrated slag particles to form active slag cement material.

2. In cement apparatus, a pair of congealing rolls, means to adjust the distance between said rolls, means to circulate cooling fluid through said rolls, a feed roll cooperating with one of said congealing rolls, means to supply substantially molten furnace slag ad acent said feed roll to be there- 'by fed in regulated quantities between -said congealing rolls and converted into a consistent plastic slag stream, a stationary conveyer cooperating with said rolls to receive the slag stream therefrom, a rotating breaker cooperatin with said conveyer to disintegrate said s ag stream into plastic particles, a moving conveyer to receive said 'slag particles, an annealing chamber cooperating with said moving conveyer' and dis: integrating and cooling means cooperatin with said moving conveyer to receive and cool -the disintegrating slag particles and form active slag cement material.

3. In cement apparatus, a cooperating pair of congealin rolls, means to supply cooling on said conveyer and cooling means to receive and cool the slag particles from said conveyer.

4. Incement apparatus a pair of congealing rolls, means to supply cooling fluid to said rolls, means to supply highly heated furnace slag to said rolls to be converted into a-consistent plastic slag stream, a conveyer cooperating-with said rolls, annealing means cooperating with said conveyer to anneal the slag material therefrom and coolin means to receive and cool the slag materia fromrsaid conveyer.-

5; In cement apparatus, means to form from. substantially molten furnace slag a substantially consistent plastic slag stream, a conveyer, means to disintegrate said slag slag to said'rolls to be converted into a con-' sistent plastic slag stream, a conveyer cooperating with said rolls, and annealing means cooperating -With--said conveyer to anneal the slag material thereon.

7. In cement apparatus, means to form from substantially molten furnace slag a substantially consistent plastic slag stream, a conveyer, means to disintegrate said slag stream into particles and deliver the same to said conveyer and means to anneal said slag material on said conveyer.

8. In cement apparatus, means to deliversubstantially plastic slagmaterial, a conveyer to receive said slag material, means toanneal said slag material and disintegrating and cooling means cooperating with said conveyer to receive the slag material therefrom.

9. In cement apparatus, means to deliver substantiallyplastic slag material, conveyer means to receive said slag material, annealing means cooperating with said conveyer and cooling means to receive the slag material from said conveyer.

10. In cement apparatus, means to deliver substantially plastic slag material, a conveyer, disintegrating means to disintegrate said slag material into particles and deliver the same to said conveyer to anneal said slag material and form active slag cement material therefrom.

11. In cement apparatus, a conveyer, and means to supply substantially plastic disintegrated slag material to said conveyer and pile the same thereon to anneal said slag "material and form active slag cement material,

12. In cement apparatus, means to form a substantially consistent stream of plastic slag material, cooling means to supply aqueous cooling jets to said stream, a con veyer and means to disintegrate said slag material and veyer to annea active slag cement material.

' 13. In cement apparatus, aconveyer, means to supply substantially plastic disintegrated slag material to said conveyer and pile thesame thereon and means to move said conveyer at regulated speed to anneal said slag. material for a predetermined time and form active slag cement material.

14. I cement apparatus, a cooperating pair of congealing rolls, means to feed 1pile the same on said conhighly heated furnace slag to said rolls to be thereby converted 'into a consistent plas said slag material and form tic slag stream, abreaker coo crating with said rolls to disintegrate sai slag stream into small highly heated particles, a conveyer to receive said slagpartioles, means to anneal said slag part1'cles onsaid conveyer and rotating agitatingcooling means to receive and cool the slag particles from said conveyer.

15. In cement apparatus, a cooperating pair of congealing rolls, means to feed highlyheated furnace slag .to said rolls to .be thereby converted/into. :a consistent iplasutic' slag stream, a breaker cooperating with said rolls to disintegrate said slag stream into heated particles, a conveyer to receive said slag particles, means to anneal said slag particles on said conveyer and agitating cooling means to receive and cool the slag particles from said conveyer.

16. In cement apparatus,'means to convert highly heated furnace slag into a con sistent plastic slag stream, a breaker cooperating With'said rolls to disintegrate said slag stream into heated particles, a conveyer to receive said slag particles, means to anneal said. slag particles on said conveyer.

17. In cement apparatus, a cooperating pair of congealing rolls, means to feed highly heated furnace slag to said rolls, to be thereby converted into a, consistent. plastic' heated condition, a breaker cooperating with said rolls to disintegrate said plastic slag into small highly heated particles, a conveyer to receive and anneal said slag particles on said conveyer and rotating cooling means to receive and cool the slag particles from said conveyer. 18. In cement apparatus, a cooperating pair of congealing rolls, means to feed highly heated furnace slag to said rolls, to be thereby converted into a consistent plastic heated condition, a breaker cooperating With said rolls to disintegrate said plastic slag into, heated particles and a conveyer to receive and anneal said slag particles on said conveyer. 19. In cement a paratus, means to form a substantially consistent body of plastic slag material, cooling means to supply aqueous cooling jets to said 'stream, a conveyer and means to disintegrate said slag material into heated plastic particles .and pile the same on said conveyer in a thick layer to anneal said slag material and. form active slag cement material. 20. In cement a paratus, means to form a substantially consistent body of plastic slag material, a conveyer,, and means to disintegrate said slag material into heated plastic 4 particles and pile the same on said conveyer to anneal said slag material and form active slag cement material.

- 21. In cement apparatus, means to form a substantially consistent mass of plastic slag material, an adjustable conveyer and means 10 material, a conveyer and means to disinte-.

grate said slag material into heated plastic articles and pile the same on said conveyer 1n a substantially uniform thick layer to anneal said slag material and form active. slag cement material.

HARRY L. DUNCAN.

Witnesses:

J Essm B. KAY, ALBERT E. THAYER. 

